量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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Using the unique characteristics of the free-electron-laser (FEL), we successfully performed high-sensitivity spectral-imaging of different materials in the terahertz (THz) and far-infrared (FIR) domain. THz imaging at various wavelengths was achieved using in-situ spectroscopy by means of this wavelength tunable and monochromatic source. In particular, owing to its large intensity and directionality we could collect high-sensitivity transmission imaging of extremely low-transparency materials and three-dimensional objects in the 3-6 THz range. By accurately identifying the intrinsic absorption wavelength of organic and inorganic materials, we succeeded in the mapping of spatial distribution of individual components. This simple imaging technique using a focusing optics and a raster scan modality has made it possible to set up and carry out fast spectral-imaging experiments on different materials in this radiation facility.
Spatially resolved spectral-imaging by a THz-FEL
